An “olfactu-digital interface” can be understood as the part of a system that enables a interspheral exchange of information between the entisphere and the digital infosphere with regard to an odour.

The term “olfactu-digital interface” was coined as part of the terminology of the “Digital Era Framework”. Within this reference framework, four spheres are distinguished on the basis of the type of information manifestation, which can be used to classify interfaces: The infosphere, which consists of the analog infosphere and the digital infosphere, the cognisphere and the entisphere.